Silver halide photographic emulsion

Abstract

Disclosed is a silver halide photographic emulsion which comprises a dispersion medium and silver halide grains, wherein said silver halide grains are prepared by a process comprising the steps of: (a) preparing a dispersion medium, wherein said dispersion medium comprises a gelatin solution, (b) introducing an oxidizer into said dispersion medium; and (c) introducing silver halide seed grains. The silver halide emulsion provides a sliver halide photographic light-sensitive material high in sensitivity and excellent in pressure resistance.

What is claimed is: 
     
       1. A silver halide photographic emulsion which comprises a dispersion medium and silver halide grains, wherein said silver halide grains are prepared by a process comprising the steps of: (a) preparing a dispersion medium, wherein said dispersion medium comprises a gelatin solution,   (b) introducing an oxidizer into said dispersion medium; and thereafter   (c) introducing silver halide seed grains.   
     
     
       2. The emulsion of claim 1, wherein said oxidizer is selected from the group consisting of an organic peroxide, a quinone, a peroxy acid salt, an ozone, a hydrogen peroxide and a halogen element. 
     
     
       3. The emulsion of claim 1, wherein an introduced amount of said oxidizer is within the range of 10 -8  to 10 -1  mols per mol of silver halide grains. 
     
     
       4. The emulsion of claim 1, wherein said silver halide seed grains comprises twinned silver halide grains. 
     
     
       5. The emulsion of claim 4, wherein said twinned silver halide grains comprises two parallel twin planes. 
     
     
       6. The emulsion of claim 1, wherein the average grain size of said silver halide grains is within the range of 0.1 μm to 3 μm. 
     
     
       7. The emulsion of claim 1, wherein the average grain size of said silver halide grains is within the range of 0.2 μm to 2 μm. 
     
     
       8. The emulsion of claim 1, wherein said silver halide emulsion is a monodisperse type emulsion, wherein: the weight of silver halide grains having a grain size within the range of ±20% around the average grain size is not less than 60% of the total weight of the silver halide grains.   
     
     
       9. The emulsion of claim 1, wherein said silver halide grains comprises a core/shell type grain, wherein the silver iodide content of said core is not less than 10 mol % to not more than the maximum solid solubility. 
     
     
       10. The emulsion of claim 1, wherein said oxidizer into said dispersion medium is introduced within 120 minutes before introducing said silver halide seed grains. 
     
     
       11. The emulsion of claim 1, wherein said oxidizer into said dispersion medium is introduced within 60 minutes before introducing said silver halide seed grains. 
     
     
       12. A silver halide photographic emulsion which comprises a dispersion medium and silver halide grains, wherein said silver halide grains are prepared by a process comprising the steps of: (a) preparing a dispersion medium, wherein said dispersion medium comprises a gelatin solution,   (b) introducing an oxidizer into said dispersion medium, wherein said oxidizer is selected from the group consisting of an organic peroxide, a quinone, a peroxy acid salt, an ozone, a hydrogen peroxide and a halogen element; and   (c) introducing silver halide seed grains, wherein said silver halide seed grains comprises twinned silver halide grains.